a lobule and 5 on the outer; thus there are about 160 to 176 tentacles altogether. Bach tentacle is grooved on its upper—i.e., oral—face. These grooves lead into a furrow running down the lobule; the latter leads to a similar furrow on the lobe; thence a furrow passes across the oral disc to the subcentral mouth, which is transversely disposed. The structure of this tentacular crown appears to relegate the worm to the genus Dendrostoma as denned by Selenka* “Challenger” Reports, vol. xiii., pt. 36 (Sipunculidæ), p. 14. and by Shipley, † “Cambridge Natural History,” p. 425. and the internal anatomy agrees with this diagnosis. Colour.—The colour of the preserved specimens is a very pale yellowish-brown, and has a shiny appearance. The posterior end in some individuals is more definitely brown, while in other cases there is a well-marked dark ring round the base of the introvert. Some individuals are nearly white. Fortunately, I have a note as to the colour and appearance of the living worms collected at Warrington. They are white and smooth to the naked eye. Some are slightly brownish. One individual has white tentacles; in another these are reddish-brown; and Dr. Agnes Kelly, who collected a number of specimens at Waiheke, has noted that they are “yellowishgrey”; and in alcohol they have a more decidedly yellow tint than those collected by me. The surface of the body is almost smooth in the preserved specimens; but posteriorly there are longitudinal and circular furrows which mark out irregular rectangular areas. These are distinctly visible in some individuals over the hinder third of the body, becoming more distinct as the extremity is approached. These rugosities appear again towards the base of the introvert. In Hutton's specimen (b), and in some individuals variously preserved, these furrows are much less evident than in others, so that the body appears in these cases much smoother and more shiny. Thus, in the Warrington specimens a hand-lens is required in order to see these very shallow circular furrows, whereas in some well-preserved individuals from Rangitoto and from Auckland they are very much more distinct, and the “raised areas” render the body rough-looking, especially posteriorly. There appear to be no papillæ, but under a hand-lens minute black dots are recognisable sparsely scattered over the body, which are probably minute papillæ. The introvert itself is smooth, paler in colour than the body, and is provided with 3 or 4 irregular circles of widely spaced blunt hooks, which are nearer together on the dorsal than on the ventral side. These circles of hooks occupy about the middle third of the introvert, the anterior margin of which is deeply pigmented, and forms a prominent collar.